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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f53d1e7338f6c45b72ed7f866f02b2ba2aa2445439de3c87ca9fbba8853f05be' 
  AND token = 'yogLxreJproNqKF5cMkP8bmvvPXrySSWLO9nboLloSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}